#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <windows.h>
#include <assert.h>

void Print_zf_sz(char*, int);
int one_my_strlen(char*);
int two_my_strlen(char*);
int three_my_strlen(char*);
char* my_strcpy(char*, char*);
char* my_strcat(char*, char*);
int add(int, int);